Need silent fans

I'm looking to add 2 or 3 120mm fans (140 won't work with my current case, but I'm looking to get a new case anyway so 140/200mm suggestions are welcome). I want them to be basically silent. They don't need to push a ton of air and can be low RPMs. I just want them to last a long time and again, be silent. I was thinking about the NZXT FN 120RB on Amazon. I've heard that NZXT fans don't always fit non-NZXT cases however, which I'd like to have

If you want silence then go with the Be Quiet! Silent Wings fans, they come in a variety of sizes and are pretty much silent at 12V. If you ran them at 7V they would make no noise at all. They are a bit pricey but I really like them.

I'm a fan (pun, lel) of the Corsair AF's as well. I have three of them in my case. They're silent, and damn good looking Just make sure to get the Quiet Edition of the AF's, since there's also a Performance Edition.

For 140mm fans I use the TY-140 (600-1300 rpm) for pushing air up, and the Scythe Slip Stream 140 (800 rpm) for pushing air sideways. For 120mm case fans I use Gentle Typhoons at 750-800 rpm in every orientation.

If I was on a budget I'd use the Slip Stream (800 or 1200 rpm) for pushing sideways. Another fine choice is the Nexus Real Silent, at 1000 rpm. For pushing air up you'd want a ball bearing or fluid dynamic bearing fan.

If you get 140mm fans with 120mm screw holes (e.g. -- TY-140 and Slip Stream 140) you can place them in most positions that call for 120mm fans. On my side panel, for example, I have a square 120x120mm fan window. But I put a Kaze Maru 2 / Slip Stream 140 fan there because the 136mm blade sweep covers the entire 120x120mm window, where a 120mm fan covers 75% or less. Additionally, a 140mm fan will move the same air with fewer rpm's than a 120mm fan. Quieter.